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Lib-Database-ObjectDB is a library for easy accessing an ObjectDB database in a JavaFX & Maven desktop application. See https://github.com/Naoghuman/lib-database-objectdb for more details.
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/**
 * Copyright (C) 2017 Naoghuman
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package com.github.naoghuman.lib.database.internal;

import com.github.naoghuman.lib.database.core.CrudService;
import com.github.naoghuman.lib.logger.core.LoggerFacade;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.persistence.TypedQuery;

/**
 * The default implementation from the {@code Interface} 
 * {@link com.github.naoghuman.lib.database.core.CrudService}.

 * Access to this class is over the facade 
 * {@link com.github.naoghuman.lib.database.core.DatabaseFacade}.
 * 
 * @author Naoghuman
 * @see com.github.naoghuman.lib.database.core.CrudService
 * @see com.github.naoghuman.lib.database.core.DatabaseFacade
 */
public final class DefaultCrudService implements CrudService {
    
    private EntityManager entityManager = null;
    
    /**
     * Constructor for the class {@code DefaultCrudService}.
     * 
     * @param entityManager The {@code javax.persistence.EntityManager}.
     * @see com.github.naoghuman.lib.database.core.CrudService
     */
    public DefaultCrudService(EntityManager entityManager) {
        this.entityManager = entityManager;
    }
    
    @Override
    public void beginTransaction() {
        entityManager.getTransaction().begin();
    }

    @Override
    public void commitTransaction() {
        entityManager.getTransaction().commit();
        entityManager.clear();
    }

    @Override
    public Long count(final String table) {
        LoggerFacade.getDefault().own(this.getClass(), "Count all entitys from the table: " + table); // NOI18N
        
        final StringBuilder sql = new StringBuilder();
        sql.append("SELECT COUNT(c) FROM "); // NOI18N
        sql.append(table);
        sql.append(" c"); // NOI18N
        
        try {
           final TypedQuery query = entityManager.createQuery(sql.toString(), Long.class);
           return query.getSingleResult();
        } catch (Exception e) {
        }
        
        return -1L;
    }

    @Override
    public  T create(final T entity) {
        return this.create(entity, Boolean.TRUE);
    }

    @Override
    public  T create(final T entity, final Boolean isSingleTransaction) {
        LoggerFacade.getDefault().own(this.getClass(),
                "Creates an entity from type: " // NOI18N
                + entity.getClass().getSimpleName()
                + " with single transaction: " + isSingleTransaction); // NOI18N
        
        if (isSingleTransaction) {
            this.beginTransaction();
        }
        
        entityManager.persist(entity);
        entityManager.flush();
        entityManager.refresh(entity);
        
        if (isSingleTransaction) {
            this.commitTransaction();
        }
        
        return entity;
    }

    @Override
    public  void delete(final Class type, final Object id) {
        this.delete(type, id, Boolean.TRUE);
    }

    @Override
    public  void delete(final Class type, final Object id, final Boolean isSingleTransaction) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Deletes the entity(id="      // NOI18N
                + (Long) id + ") from type: " // NOI18N
                + type.getClass().getSimpleName()
                + " with single transaction: " + isSingleTransaction); // NOI18N
        
        if (isSingleTransaction) {
            this.beginTransaction();
        }
        
        final Object ref = entityManager.getReference(type, id);
        entityManager.remove(ref);
        
        if (isSingleTransaction) {
            this.commitTransaction();
        }
    }

    @Override
    public  T update(final T entity) {
        return this.update(entity, Boolean.TRUE);
    }

    @Override
    public  T update(final T entity, final Boolean isSingleTransaction) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Updates the entity from type: " // NOI18N
                + entity.getClass().getSimpleName()
                + " with single transaction: " + isSingleTransaction); // NOI18N);
        
        if (isSingleTransaction) {
            this.beginTransaction();
        }
        
        final Object ref = entityManager.merge(entity);
        
        if (isSingleTransaction) {
            this.commitTransaction();
        }
        
        return (T) ref;
    }

    @Override
    public  T findById(final Class type, final Object id) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Find the entity(" // NOI18N
                + (Long) id + ") from type: " // NOI18N
                + type.getClass().getSimpleName());
        
        return (T) entityManager.find(type, id);
    }

    @Override
    public  List findByNamedQuery(final Class type, final String queryName) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Find by named query: " // NOI18N
                + queryName);
        
        return entityManager
                .createNamedQuery(queryName, type)
                .getResultList();
    }

    @Override
    public  List findByNamedQuery(final Class type, final String queryName, final int resultLimit) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Find by named query: " // NOI18N
                + queryName + " with result limit: " + resultLimit); // NOI18N
        
        return entityManager
                .createNamedQuery(queryName, type)
                .setMaxResults(resultLimit)
                .getResultList();
    }

    @Override
    public  List findByNamedQuery(final Class type, final String queryName, final Map parameters) {
        return this.findByNamedQuery(type, queryName, parameters, 0);
    }

    @Override
    public  List findByNamedQuery(final Class type, final String queryName, final Map parameters, final int resultLimit) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Find by named query: " // NOI18N
                + queryName + " with result limit: " + resultLimit // NOI18N
                + " and with additional parameter."); // NOI18N
        
        final Set> entrySet = parameters.entrySet();
        final TypedQuery query = entityManager.createNamedQuery(queryName, type);
        if (resultLimit > 0) {
            query.setMaxResults(resultLimit);
        }
        
        entrySet.stream().forEach((entry) -> {
            query.setParameter(entry.getKey(), entry.getValue());
        });
        
        return query.getResultList();
    }

    @Override
    public  List findByNativeQuery(final Class type, final String sql) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Find by native query: " // NOI18N
                + sql + " with type: " + type.getClass().getSimpleName()); // NOI18N
        
        return entityManager
                .createNativeQuery(sql, type)
                .getResultList();
    }

    @Override
    public  List findByNativeQuery(final Class type, final String sql, final int resultLimit) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Find by native query: " // NOI18N
                + sql + " with type: " + type.getClass().getSimpleName() // NOI18N
                + " and with result limit: " + resultLimit); // NOI18N
        
        return entityManager
                .createNativeQuery(sql, type)
                .setMaxResults(resultLimit)
                .getResultList();
    }

    @Override
    public  List findByNativeQuery(final Class type, final String sql, final Map parameters) {
        return this.findByNativeQuery(type, sql, parameters, 0);
    }

    @Override
    public  List findByNativeQuery(final Class type, final String sql, final Map parameters, final int resultLimit) {
        LoggerFacade.getDefault().own(this.getClass(), 
                "Find by native query: " // NOI18N
                + sql + " with type: " + type.getClass().getSimpleName() // NOI18N
                + " and with result limit: " + resultLimit // NOI18N
                + " and with additional parameter."); // NOI18N
        
        final Set> entrySet = parameters.entrySet();
        final Query query = entityManager.createNativeQuery(sql, type);
        if (resultLimit > 0) {
            query.setMaxResults(resultLimit);
        }
        
        entrySet.stream().forEach((entry) -> {
            query.setParameter(entry.getKey(), entry.getValue());
        });
        
        return query.getResultList();
    }

    @Override
    public EntityManager getEntityManager() {
        return entityManager;
    }

    @Override
    public void shutdown(final String name) {
        LoggerFacade.getDefault().own(this.getClass(), "Shutdown EntityManager: " + name); // NOI18N
        
        if (entityManager != null && entityManager.isOpen()) {
            entityManager.close();
            entityManager = null;
        }
    }
    
}